/// <summary>
/// Parses the TPI from specified <see cref="MemoryStream"/>.
/// </summary>
/// <param name="Stream">Instance of <see cref="MemoryStream"/> containing the TPI file data.</param>
/// <returns>Parsed data of TPI as <see cref="TPIPackageClass"/>.</returns>
public static TPIPackageClass FromStream(MemoryStream Stream)
{
using (Stream Bytes = new MemoryStream(Stream.ToArray()))
{
try
{
TPIPackageClass Pack = Expressions.CreateTPIPackage();
while (ConditionsOK(Bytes))
{
uint Header = Expressions.GetUNumber(Expressions.GetBytes(Bytes, 0, 4));
if (Header == (uint)ChunkType.Head)
{
//Processing the HEAD. Reading first 4 bytes to find out length.
int Next = Expressions.GetNumber(Expressions.GetBytes(Bytes, 0, 4));
//Buaa getting all bytes now.
byte[] Data = Expressions.GetBytes(Bytes, 0, Next);
Pack.PackageID = Expressions.GetCRCID(Data.SubArray(0, 4));
//Next 4 bytes are indicating total files used by this TPI. But it is read-only because it uses the ones
//actually parsed by the parser.
//Now, we should have DATA. Ending this if else.
}
else if (Header == (uint)ChunkType.Data)
{
//Processing the DATA.
int Next = Expressions.GetNumber(Expressions.GetBytes(Bytes, 0, 4));
//Fun part ;)
int NameLen = Expressions.GetUNumber16(Expressions.GetBytes(Bytes, 0, 2));
Pack.PackageName = Expressions.GetText(Bytes, 0, NameLen);
int VerLen = Expressions.GetUNumber16(Expressions.GetBytes(Bytes, 0, 2));
Pack.PackageVer = Expressions.GetText(Bytes, 0, VerLen);
int OwnerLen = Expressions.GetUNumber16(Expressions.GetBytes(Bytes, 0, 2));
Pack.PackageOwner = Expressions.GetText(Bytes, 0, OwnerLen);
Pack.Type = (PackageType)Expressions.GetNumber(Expressions.GetBytes(Bytes, 0, 4));
//Now, we should have FILEs. Ending this if else and letting while continue it's work.
}
else if (Header == (uint)ChunkType.File)
{
TTFileClass File = Expressions.CreateTTFile();
int Next = Expressions.GetNumber(Expressions.GetBytes(Bytes, 0, 4));
File.CRC = Expressions.GetCRCID(Expressions.GetBytes(Bytes, 0, 4));
File.FileSize = Expressions.GetUNumber(Expressions.GetBytes(Bytes, 0, 4));
int namelen = Expressions.GetUNumber16(Expressions.GetBytes(Bytes, 0, 2));
File.FileName = Expressions.GetText(Bytes, 0, namelen);
//No NULs after file name, so let while loop read next header if Stream not ended.
//Let's add file to collection...
Pack.Files.Add(File);
}
else
{
//Hmm...
}
}
//Return when everything is good to go.
return(Pack);
}
catch (Exception ex)
{
throw new TPIParserException("Failed to parse TPI.", ex); //Wrapping the exception to our TPIParserException class.
}
}
}
